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Improvement on the performance of chemically cross-linked fricke methylthymol-blue radiochromic gel dosimeter by addition of dimethyl sulfoxide
Radiation Measurements ( IF 2 ) Pub Date : 2021-02-04 , DOI: 10.1016/j.radmeas.2021.106540
Khalid A. Rabaeh , Molham M. Eyadeh , Tariq F. Hailat , Balázs G. Madas , Feras M. Aldweri , Ali M. Almomani , Samer I. Awad

The effect of free radical scavenger dimethyl sulfoxide (DMSO) on the performance of transparent Fricke methylthymol blue dye (MTB)-polyvinyl alcohol (PVA)-chemical cross-linking agent glutaraldehyde (GTA) dosimeter (MTB-PVA-GTA) was studied and evaluated using two optical detection methods. By adding different concentrations of DMSO, the properties of the dosimeter were analyzed by ultraviolet–visible (UV–Vis) spectrometry and using 2-D optical imaging system based on a charge-coupled-device (CCD) camera with a diffusing red-light surface. The gel dosimeters were irradiated using 6, 10, and 15 MV photon beams of a medical linear accelerator at various dose rates. Linear absorbance-dose relationships was obtained in the range 0–10 Gy with DMSO ranging from 0 to 3000 mM. No significant changes to the dependence of the response on the dose rate (150, 300, and 600 cGy/min) and the photon energy (6, 10, and 15 MV photon beams) were observed by adding DMSO to the dosimeter. In general, increasing DMSO concentration reduced sensitivity, reduced diffusion coefficient, and enhanced the stability of the dosimeter. The addition of DMSO to the Fricke MTB-PVA-GTA dosimeter showed a good measured sensitivity and a significant low diffusion coefficient when compared with the values measured for other Fricke radiochromic dosimeters reported previously. This improved composition shows a lower diffusion coefficient with respect to those reported so far for a Fricke dosimeter with PVA and gelatin gel. The total uncertainty of the Fricke dosimeter were 4.6%.



中文翻译:

加入二甲亚砜可改善化学交联的弗里克甲基百里香酚蓝放射变色凝胶剂量计的性能

研究了自由基清除剂二甲基亚砜(DMSO)对透明Fricke甲基百里香酚蓝染料(MTB)-聚乙烯醇(PVA)-化学交联剂戊二醛(GTA)剂量计(MTB-PVA-GTA)性能的影响,使用两种光学检测方法进行评估。通过添加不同浓度的DMSO,通过紫外可见光谱(UV-Vis)并使用基于电荷耦合器件(CCD)相机并带有散射红光的2-D光学成像系统来分析剂量计的性能。表面。使用医用线性加速器的6、10和15 MV光子束以各种剂量率辐照凝胶剂量计。线性吸光度-剂量关系在0-10 Gy范围内,DMSO为0至3000 mM。响应对剂量率的依赖性没有明显变化(150,300和600 cGy / min)和光子能量(6、10和15 MV光子束)通过在剂量计中添加DMSO来观察。通常,增加DMSO浓度会降低灵敏度,降低扩散系数并提高剂量计的稳定性。与先前报道的其他Fricke放射性变色剂量计相比,在Fricke MTB-PVA-GTA剂量计中添加DMSO显示出良好的测量灵敏度和较低的扩散系数。相对于迄今为止报道的具有PVA和明胶的Fricke剂量计,这种改进的组合物显示出较低的扩散系数。Fricke剂量计的总不确定度为4.6%。增加DMSO浓度会降低灵敏度,降低扩散系数并增强剂量计的稳定性。与先前报道的其他Fricke放射性变色剂量计相比,在Fricke MTB-PVA-GTA剂量计中添加DMSO显示出良好的测量灵敏度和较低的扩散系数。相对于迄今为止报道的具有PVA和明胶的Fricke剂量计,这种改进的组合物显示出较低的扩散系数。Fricke剂量计的总不确定度为4.6%。增加DMSO浓度会降低灵敏度,降低扩散系数并增强剂量计的稳定性。与先前报道的其他Fricke放射性变色剂量计相比,在Fricke MTB-PVA-GTA剂量计中添加DMSO显示出良好的测量灵敏度和较低的扩散系数。相对于迄今为止报道的具有PVA和明胶的Fricke剂量计,这种改进的组合物显示出较低的扩散系数。Fricke剂量计的总不确定度为4.6%。与先前报道的其他Fricke放射性变色剂量计相比,在Fricke MTB-PVA-GTA剂量计中添加DMSO显示出良好的测量灵敏度和较低的扩散系数。相对于迄今为止报道的具有PVA和明胶的Fricke剂量计,这种改进的组合物显示出较低的扩散系数。Fricke剂量计的总不确定度为4.6%。与先前报道的其他Fricke放射性变色剂量计相比,在Fricke MTB-PVA-GTA剂量计中添加DMSO显示出良好的测量灵敏度和较低的扩散系数。相对于迄今为止报道的具有PVA和明胶的Fricke剂量计,这种改进的组合物显示出较低的扩散系数。Fricke剂量计的总不确定度为4.6%。

更新日期:2021-02-08
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